Amoeba

Template:Classification Amoebas are microscopic one-celled organisms that were first shown in the episode Goo Goo Gas when SpongeBob turned Plankton into a baby. He was shrunken down after being hit by the Goo Goo Gas to microscopic smallness. The Amoebas were shown to say that Plankton's baby size is microscopic.

Plankton also gets a pet amoeba in Plankton's Pet and names him Spot. Spot looks much different than the amoebas in Goo Goo Gas.